Manufacture of artificial leather



Patented Dec. 4, 1928.

UNITED STATES PATENT OFFICE.

PHILIP MAGNUS, or LEICHHARDT, NEAR SYDNEY, NEW sour wALEs'AUs'rnALIA.

MANUFACTURE OF ARTIFICIAL LEATHER.

No Drawing. Application filed February 12, 1926, Serial No 87,978, and.in Australia March 2, 1925.

This invention relates to an improved process for the manufacture ofartificial leather and to a material resulting therefrom.

In the carrying out of the process waste or scrap leather is utilized.Such leather is preferably first sieved or otherwise suitably treatedfor the-purpose of separating therefrom grit or dirt or other extraneousmatter."

The cleaned scrap or waste leather is then treated in a compoundedmixture composed of the following ingredients z-glue, glycerine, boiledlinseed oil, carbolic oil, ammonium bichromate and calcium chloride.Said treatment consists in adding to such mixture Whilst it is beingheated or boiled a sufliciency of the scrap or waste leather. Usually itWill be found that to said mixture a proportion of approximately 25% ofscrap or waste leather should be added during the heating or boilingoperation. Before the scrap or waste leather is added to the mixture thelatter is heated or boiled until the whole of the ingredientsthereofhave become thoroughly incorporated.

When the ingredients of the compound consisting of the said liquidmixture with the waste or scrap leather are thoroughly blended the massis placed in suitable moulds where it is subjected to appropriatepressure, say a pressure of from one quarter to one ton per square 1nch.

As one example of the llquid mixture the following ingredients in thefollowing approximate proportions may be used Ptir ccnt. Glue 7'0Glycerine 12 Boiled linseed oil 10 Carbolic oil 2 Ammonium bichromate 2lalcium chloride 2 of boot or shoe heels and soles and other articles.Such leather has been found to be less brittle; to have morewaterproofing qualities; and to be easier of working than ordinaryleather, Whilst its cost of production and the manufacture of articlestherefrom are economical.

In case of necessity any scrap or waste leather ofasize too large fortreatment as above described may previously be reduced in size to fit itfor use in accordance with the process herein described. Glue isemployed as an adhesive or binder; glycerine prevents the molded massfrom becoming brittle; ammonium bichromate renders the leather. compoundwaterproof and insoluble in water; while the calcium chloride preventsthe glue from cracking. Any substances other than carbolic oil can beutilized in the liquid compound, such oil having for its object to avoidputrefaction of the artificial leather. Similarly, for boiled linseedoil any other suitable oil may be substituted; the said oil is added tothe liquid compound to ensure the strength and drying qualities of theartificial leather. In the appended claims the terms carbolic oil andboiled linseed oil are to be read to include any oils suitable for thepurposes herein described for which carbolic oil and boiled linseed oilare used in the liquid compound to which the scrap leather is added.

What I claim as my invention and desire to secure by Letters Patentis 1. An artificial leather consisting of cleaned scrap leatherincorporated in a mixture of glue, glycerine, boiled linseed oil-earbolic oil, ammonium bichromate and monium bichromate 2 and calciumchloride 2 In testimony whereof I aflix my signature. 1

PHILIP MAGNUS.

